Novel determination of radon-222 velocity in deep subsurface rocks, and the feasibility to using radon as an earthquake precursor

Hovav Zafrir1, Yochai Ben Horin2 and Uri Malik1

1. The Geological Survey of Israel, 30 Malkhei Israel St., Jerusalem 95501, Israel.

2.  Soreq Nuclear Research center, Yavne 81800, Israel


Novel technique utilizing simultaneous radon monitoring by gamma and alpha detectors to differentiate between the radon climatic driving forces and others has been improved for deep subsurface investigation.

Detailed long-term monitoring served as a proxy for studding radon movement within shallow and deep subsurface, as well as to analyzing the effect of various parameters on the transport pattern.

The main achievements are: a) determination, for the first time, of the radon movement velocity within rock layers at depth of several tens of meters being in average 25 meters per hour; b) distinguishing between the diurnal periodical effect of the ambient temperature and the semi-diurnal effect of the ambient pressure, on the radon temporal spectrum; c) a radon random pre-seismic anomaly was revealed preceding the Nuweiba, M5.5 earthquake of 27 June 2015 that occurred within Dead Sea Fault Zone.


תאריך 3/01/2016 10:30 12:00
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